The singer has been teasing the challenge for more than a year now, and today she got lathered up in a new photoshoot preparation for the charity challenge that will take place on live on BBC One during Comic Relief night.
And Jessie has vowed to get rid of almost all of her hair, leaving just 0.5mm!
Jessie, who will be back on The Voice UK later in the Spring, said: “I’ve loved watching Red Nose Day since I was a kid and I’m so excited to join this year’s team of celebrity fundraisers.
“So I’ll be shaving my head live on the night! I won’t deny I’m nervous.
“Together with help from the UK public, we are on a mission to raise more money than ever before for Red Nose Day in March. So come on, let’s do it!”
We can't wait to see the results!
Comic Relief will air on BBC One in March.